| | Adair County | MO | 29001 | | Kirksville, MO 28860 | | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=AdairCounty+MO |
| | Andrew County | MO | 29003 | | St. Joseph, MO-KS 41140 | Kansas City-Overland
Park-Kansas City, MO-KS 312 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=AndrewCounty+MO |
| | Atchison County | MO | 29005 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=AtchisonCounty+MO |
| | Audrain County | MO | 29007 | | Mexico, MO 33020 | Columbia-Jefferson
City-Moberly, MO 190 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=AudrainCounty+MO |
| | Barry County | MO | 29009 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=BarryCounty+MO |
| | Barton County | MO | 29011 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=BartonCounty+MO |
| | Bates County | MO | 29013 | | Kansas City, MO-KS 28140 | Kansas City-Overland
Park-Kansas City, MO-KS 312 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=BatesCounty+MO |
| | Benton County | MO | 29015 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=BentonCounty+MO |
| | Bollinger County | MO | 29017 | | Cape Girardeau, MO-IL 16020 | Cape Girardeau-Sikeston,
MO-IL 164 | Outlying | metro county (urban) | farm-dependent | https://maps.google.com/?q=BollingerCounty+MO |
| | Boone County | MO | 29019 | | Columbia, MO 17860 | Columbia-Jefferson
City-Moberly, MO 190 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=BooneCounty+MO |